Xml text

ok so everyones theres a million tutorials online on how to use an xml file to load up text. What im trying to do is have a bunch of buttons that each load up a different section of the text or a different file all together. I have no knowldge of xml but ive played with code before to make ot work for me. Is there a simple on(release){
loadxmltext
}

code? or is it a little more complicated than that? Any help or pointing in the right direction would be very helpful. thanks!!